That's great if you're not at all shot in the wallet department and don't have the ability/a friend with the ability to build one. £1700 for the "base" system? That's almost Apple-like in gargantuan pricing schemes for what isn't exactly a completely top end system.
Anyone actually priced up the components separately? I would be looking to pay that amount of money if it had a good couple of TB storage, SSD boot drive, 4870X2 or similar in the graphics department and some goodies thrown in.